Lubricating system for motion picture projectors



Apg. 13, 1940.

K. BRENKERT LUBRICATING SYSTEM FOR MOTION PICTURE PRQJECTORS Filed Oct. l, 1958 2 Sheets-Sheet 1 INVENTO R KARL BRENNER-r ATTORNEY.

Aug- 13, 1940- K. BRENKERT 2,21l`,363

LUBRICATING SYSTEM FOR MOTION PICTURE PROJECTORS Filed Oct. 1, 1938 2 Sheets-Sheet 2 INVENTDR. BRENKERT BQM/whm ATTORNEY.

Patented Aug. 13, 1940 unirse STATES eArENT oFFijcE LUBRICATING SYSTEM.' FOR MOTION PICTURE PROJECTORS Application October l, 1938, Serial No. 232,813

6 Claims.

The present invention pertains to a novel 1ubricating system for motion picture projectors. The principal object of the invention is to provide a continuous system. that is thoroughly reliable and eiiective as well as comparatively simple and inexpensive in construction. Although various lubricating systems are now in use, they are either unreliable or too complicated and expensive. These objections are overcome by 1U means o-f the present invention.

Another objectof the invention is to provide concentrated and intensified lubrication wherever required, while the remainder of the system is subjected to a general spray of lubricant.

35 These objects are accomplished by forcing the lubricant to a reservoir above the mechanism, permitting the lubricant to drip from the reservoir, and dispersing the dripping lubricant throughout the mechanism. At certain shafts im and other parts requiring more lubrication, suitable collectors are provided to accumulate substantial quantities of the sprayed lubricant and deliver it to such parts.

The invention is fully disclosed by way of ex- 25 ample by the following description and the accompanying drawings, in which Figure l is a vertical section through a projector, illustrating the gear trains and the means for lubricating them;

30 Figure 2 is a section on the line 2-2 of Figure Figure 3 is a section on the line 3 3 of Figure 2 and- Figure 4 is a detail section of the gear pump.

Reference to these views will now be made by use of like characters that are employed to designate corresponding parts throughout.

In Figures 1 and 2 is illustrated the projector housing I in a Vertical plane parallel to the shut- 4U ter shaft. The interior of the housing is divided by a vertical partition 2 into a lm compartment 3 and a mechanism compartment l. The compartments are fluid tight with respect to each other since the lubricant in the mechanism compartment must not leak into the ilm compartment. The outer side wall 5 ofthe mechanism compartment is necessarily aseparate member to permit assembly of the mechanism and is 5U subsequently hermetically sealed to the body of lthe housing. The outer side wall t of the film compartment is in the form of a door to permit access to the interior of the compartment.

The operating mechanism in the compartment 5,-, 4 may be regarded as conventional, so far as dicular to and extend through the partition 2,

and the shutter shafts I2, I3 perpendicular to the rst named shafts and extending through the housing as illustrated in Figure 1.

At the base of the housing is a drive motor I3. In the bottom of the housing is a gear pump comprising a casing I4 and a pair of meshing gears I5 therein in the usual manner.

A train of gearing I6 is provided between the motor I3' and the intermittent mechanism built around shaft II. This gearing, as well as other gearing presently to be described, is designed for transmission of power and proper speed reduction. The intermittent mechanism operating on the shaft I I is enclosed in a casing I'i. 'Ihe train I6 also kconnects with a driving gear I8 on the 25 outside of the pump casing I4 and co-aXial with one of the gears therein.

The train I6 is extended at I9 to mesh with spur teeth 20 on one side of a shutter actuating gear, the other side of which has bevel teeth 2 I. 3o The shaft I2 lies within the shaft I3, both being properly journaled and the carrying bevel pinions 22 `and 23 respectively meshing with the bevel gear 28 at diametrically opposite points.

The shafts extend through a bearing 24 and 35i into a shutter housing 25 exterior of the main housing lI. Within the housing 25, the shafts I2 and I3 carry shutter blades 2S and 2l that rotate in opposite directionsk across a shutter opening (not shown). 4@

The gear teeth 20 mesh with a gear. 28 on the upper sprocket shaft Il), whereby the latter is actuated. 'I'he gear 28 drives a mechanism 29 for operating the usual governor'and fire shutter as well as a Ventilating fan (not shown). Adjacent to the gear 28 is a framing mechanism 3i) also comprising gears which, however, are not in mesh with the gear 28. This mechanism also comprises the bar 3l linked inthe usual manner toparts 32 associated with the intermit- 50 tent mechanism for adjusting the latter with reference to the timing of the shutter in the usual manner, known in the art as framing.

On the top of the housing I, preferably directly over the gear 28, is an oil reservoir including preferably a transparent side wall 33 with a horizontal dividing screen 34 therein. An oil supply pipe 35 extends from the outlet side of the pump to the space above the screen 34, preferably through the bottom of the reservoir for compactness. The pump intake pipe 36 extends to the iioor or base of the housing I, as illustrated in Figure 1 From the bottom of the reservoir, drip pipes 31 extend downwardly to opposite sides of the gear 28. Both sides of the gear carry substantially radial blades or paddles 38 which are preferably staggered from one side to the other as may be seen in Figures 1 and 2. The oil dripping from the pipes 31 is picked up and struck by the rapidly revolving blades 38 and thereby sprayed over the entire mechanism within the mechanism compartment 4. The oil that drains off the mechanism collects in the bottom of the housing I, and is picked up through the pump inlet 36 to be recirculated. Any solid matter collected by the lubricant is filtered out by the screen 34.

It is desired that the intermittent mechanism within the casing I1 operate in a bath of oil. Therefore, the top of the casing is formed with an opening 39 and diverging plates 48 at the ends of the opening. The plates collect the spray over a substantial area and deliver it into the casing I1.

'Ihe shaft II also requires special lubrication. To meet this requirement, the fixed bearing 4I of the shaft is formed with a port 42 registering with a similarly ported bushing 43 between the shaft and the bearing. Diverging plates 44 are secured to the bearing 4I at opposite sides of the port 42 to collect a quantity of lubricant and direct it into the bearing. Similar devices may be provided wherever desired throughout the gearing as indicated by the numerals 45 and 4G in Figure 1.

To lubricate the shafts I2 and I3 in their bearing 24, the latter has a port 41 registering with a similarly ported bushing 48 within the bearing. Above the bearing, a combination trough and bearing 49 is provided for the shaft I Il. A spout 50 is carried by the housing in coml munication with the trough and is so positioned as to direct lubricant from the trough into the port 41.

In one of the walls of the housing I is a window 5I near the pump I4 for observing the oil level. The window is on a slope but takes a substantially horizontal position when the housing is tilted forward in operation.

The shafts I U and II are extended through the partition 2 into the compartment 3 and are there provided with the usual film feed sprockets 52 and 53 respectively. Between the sprockets is the usual gate 54. The third sprocket is not shown, but its shaft is indicated by the numeral 55 in Figure 1 within the gear train I6.

It will now be evident that the invention provides a lubricating system of the character described that is comparatively simple in manufacture and thoroughly effective in operation. The construction herein described does away with individual piping to the parts to be lubricated and likewise eliminates possible clogging of such piping with the resulting serious damage to the machine from this cause. The lubrication of the mechanism by rapidly striking the dripping oil with rotating blades, as herein described, is equally thorough and effective regardless of the angle to which the projector is tilted inuse.

Although a specic embodiment of the invention has been illustrated and described, it will be understood that various alterations in the details of construction may be made without departing from the scope of the invention, as indicated by the appended claims.

What I claim is:

1. In a motion picture machine, a housing, a plurality of parts therein to be lubricated, a rotary member mounted in said housing, radially disposed blades carried by said member and extending laterally therefrom and means for dropping oil into the path of said blades above the rotary axis of said member, the inner ends of said blades being spaced from said rotary axis, the spaces thus formed being at least partially unobstructed to permit oil to flow between blades above the axis and into the path of blades below the axis, whereby oil is sprayed from said blades in opposite directions from said axis and throughout said housing.

2. In a motion picture machine, a housing, a plurality of parts therein to be lubricated, a rotary member mounted in said housing, radially disposed blades carried by said member and extending laterally therefrom, said blades spaced around the rotary axis of said member, and means for dropping oil into the path of said blades, whereby oil is sprayed from said blades throughout said housing, the structure in said axis being such as to permit oil to flow between blades above the axis and into the path of blades below the axis, whereby oil is sprayed in opposite directions from said axis.

3. In a motion picture machine, a housing, a plurality of parts therein to be lubricated, a rotary member mounted in said housing, separate blades attached to said member and extending laterally therefrom in opposite directions, and means for dropping oil into the path of said blades, whereby oil is sprayed from said blades throughout said housing.

4. In a motion picture machine, a housing, a plurality of parts therein to be lubricated, a rotary shaft therein, a supporting member carried by said shaft in a plane perpendicular thereto, means carried laterally by said mem- 5.

ber for throwing oil in substantially opposite directions from the axis of said shaft, and means for delivering oil to the rst means.

5. In a motion picture machine, a housing, a

plurality of parts therein to be lubricated, a rotary shaft therein, a supporting member carried by said shaft in a plane perpendicular thereto, means carried by said member and within the circular periphery thereof for throwing oil in substantially opposite directions from the axis of said shaft, and means for delivering oil to the first means.

6. In a motion picture machine, a housing, a plurality of parts therein to be lubricated, a rotary shaft therein, a supporting member carried by said shaft in a plane perpendicular thereto, means carried laterally by said member and within the circular periphery thereof for throwing oil in substantially opposite directions from the axis of said shaft, and means for delivering oil to the first means.

KARL BRENKERT. 

